<template>
  <div>
    <h1>当前求和值为:{{ sum }}</h1>
    <h1>当前求和值乘以是为:{{ bigSum }}</h1>
    <h2>我在{{ school }}学习{{ subject }}</h2>
    <select v-model.number="n">
      <option value="1">1</option>
      <option value="2">2</option>
      <option value="3">3</option>
    </select>
    <button @click="increment">加</button>
    <button @click="decrement">减</button>
    <button @click="incrementOdd">当前求和为奇数再加</button>
    <button @click="incrementWait">等等再加</button>
  </div>
</template>

<script>
import { mapState, mapGetters } from "vuex";
export default {
  name: "Count",
  data() {
    return {
      n: 1,
    };
  },
  computed: {
    // sum() {
    //   return this.$store.state.sum;
    // },
    // subject() {
    //   return this.$store.state.subject;
    // },

    // school() {
    //   return this.$store.state.school;
    // },

    //mapState 获取 store 中的数据(对象写法)
    // ...mapState({ sum: "sum", subject: "subject", school: "school" }),

    // mapState 获取 store 中的数据(数组写法)
    ...mapState(["sum", "subject", "school"]),
    // ---------------------
    // bigSum() {
    //   return this.$store.getters.bigSum;
    // },
    //mapGetters 获取 store 中的数据(对象写法)
    ...mapGetters({ bigSum: "bigSum" }),
    //mapGetters 获取 store 中的数据(数组写法)
    ...mapGetters(["bigSum"]),
  },
  methods: {
    increment() {
      this.$store.commit("JIA", this.n);
    },
    decrement() {
      this.$store.commit("JIAN", this.n);
    },
    incrementOdd() {
      this.$store.dispatch("jiaOdd", this.n);
    },
    incrementWait() {
      this.$store.dispatch("jiaWait", this.n);
    },
  },
};
</script>
